I've checked the search feature to see if this topic has been posted before but couldn't find anything. So, forgive me if I'm re-posting an old topic. I have noticed some times that when i'm playing the assassin, when i press the run button, her run will activate for like a split second and then stop. She will then precede to run funny. The problem only fixes itself when i die and respawn. Hope that i've described the problem so that you can understand what i'm trying to say.
You obviously didn't search very hard... It's called stutter-stepping and it's a known bug. Not sure why it or other known bugs or bad balancing weren't patched with the last update, but whatever.
Yes, it is mostly referred to as stutter-stepping but how would anyone know what that is if it hasn't been explained multiple times before?